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Chemical Reaction Controlled Release

  • Chapter
Controlled Release

Part of the book series: Polymers ((POLYMERS,volume 13))

Abstract

The polymer utilized in diffusion-controlled release devices or systems plays a relatively passive role. It serves simply as a carrier and retards the rate at which the active agent is delivered to the target. Nevertheless, some polymeric carriers are designed to play a more active role in the release process. These polymers undergo chemical reactions at the target site, thereby enabling the active agent to be delivered. Such chemically activated systems fall into two broad categories (Langer, 1980; Baker, 1987):

  1. i.

    Physical immobilization systems, also called erodible or (bio)degradable systems in each of which the active agent, physically immobilized within the polymer network, is released by erosion of this network (Fig. 3.1a)

  2. ii.

    Chemical immobilization systems, in each of which the active agent is either chemically bonded to the polymer carrier backbone (pendant chain) or is part of the backbone itself (polyagents). Release occurs by hydrolytic or enzymatic degradation of the appropriate bonds (Fig. 3.1b).

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Authors and Affiliations

  1. Department of Chemical Engineering, Kansas State University, Durland Hall, Manhattan, KS, 66506, USA

    Professor Liang-tseng Fan

  2. Kabi Pharma, Gårdsvägen 6, Box 1828, Solna, S-171 26, Sweden

    Dr. Satish Kumar Singh

Authors
  1. Professor Liang-tseng Fan
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  2. Dr. Satish Kumar Singh
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© 1989 Springer-Verlag, Berlin Heidelberg

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Fan, Lt., Singh, S.K. (1989). Chemical Reaction Controlled Release. In: Controlled Release. Polymers, vol 13. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74507-2_3

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  • DOI: https://doi.org/10.1007/978-3-642-74507-2_3

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-74509-6

  • Online ISBN: 978-3-642-74507-2

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